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NITED STATES PATENT OFFICE.-

GEORGENV. NELSON, OF NEVV YORK, N. Y.

BURGLAR-ALARM.

BPECIFICATIQN forming part of Letters Patent No. 334,888, dated .Tanuary 26,1886.

Application filed May 1, 1885. Serial No. 164,132. (No model.)

To all whom it may concern.-

of New York city, county of New York, and State of New York, have invented certain new and useful Improvements in a Combined Burglar-Alarm and Call-Bell, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention has relation to that class of devices wherein a bell hammer or striker is moved by spring-actuated gears for the purpose of sounding an alarm or call; and the object of my invention is to produce a simple, compact, and convenient apparatus, which may be employed in any location for a burglar-alarm, and which may also be used upon a desk or table after the manner and for the usual purposes of a call-bell without destroying its efficiency or interfering with its opera tion at any time as a burglaralarm, and which apparatus shall be so arranged that the ringing of the hell or the movement of the strikinghammer may be quickly and easily permitted or arrested at any time.

To accomplish this my improvements involve certain novel and useful peculiarities of construction, relative arrangements or combinations of parts, and details of manufacture, all of whichwillbe herein first fully described, and then pointed out in the claims.

In the accompanying drawings, forming a 1 part of this specification, Figurel is a front elevation showing the bell mounted upon its standard and hanging in the vertical position which it assumes when the connecting cords or wires are detached or loosened. Fig. 2 is a vertical section and partial elevation upon a scale enlarged beyond that of Fig. 1, showing the location and arrangement of the vertical rod which carries the holding pin or projection by which the ringing or movement of the hammer is arrested-or controlled; and Fig. 3 is an elevation upon a plane at right angles to that of Fig. 2, and showing same parts, the bell and standard in both these figures being omitted. Fig. 4is an elevation of a portion of the vertical rod, showing one manner of applying a flat spring in connection therewith,

instead of the spiral spring shown in other 1 figures, the same being in accordance with my Be it known that I, GEORGE W. NELsoN,

Fig. 7 is an elevation showing a fragment of the edge of a door with my improved hook applied over the spring-latch of the look after the manner of my invention. Fig. 8 represents a face and edge view of my improved form of a hook or catch employed for holding one end of theline or cord leading to the bell. Fig. 9 is a perspective View indicating one manner of connecting a door and a window: and Fig. 10 an elevation showing two windows connected with acord or line, in each the connecting cord or line being supplied with another cord or line intended to lead to the hell, in accordance with my invention.

In all these figures like letters of reference, wherever they occur, indicate corresponding parts.

A is a suitable standard or base, of metal, and B B are the two parts of the bell mounted upon an arm of the base, as upon a shaft, 0, entering said arm and free to swing back and forth upon said shaft. \Vithin the bell is the hammer D, moved rapidly (when free to move) by the spring-actuated escapement-wheel E throughthe medium of escapement-pallets a a, connected with the shaft F, upon which the hammer is hung by rod or wire D.

G is the windingshaft, and H the projecting key, which may be detached whenever desired.

The particular construction or arrangement of the spring and gears by which the escapement-wheel is moved are neither essential features of this invention, for,ohviously, they may be variously modified. Avertical rod, I, projects through the bell and carries a pin, 11, located below the rod D, and athumb-piece or finger-piece, 0, at its upper end, the rod I being so located that when the bell swings upon its bearing the upper end of this rod will travel close to the location of the hearing. The rod ICO but permit it to be forced down against the action of the spring. The spring may be spiral, as shown at d, Figs. 1, 2, 3, or it may be flat, as indicated at d in Fig. 4, either form being sufficient for the purposes intended. In the first form the pin 'b receives the force of the spring, and in the second a pin, e, may be supplied for the purpose. When the rod I is elevated, the pin 1) bears upon rod D and holds one of the pallets a in engagement with the escapementwheel, so that the latter cannot turn, and therefore so that the hammer cannot be moved to strike the bell. As soon as the rod I is depressed, either by the finger or otherwise, the escapementwheel is left free to turn, and the ringing commences, and will continue until the rod is allowed to rise, or

until the mainspring of the apparatus runs down or expends its force.

Upon the axis upon which the bell swings, or at other convenient point, is a movable or adjustable tripper, K, having a convenient projecting finger-piece by which it may be turned up or down or otherwise adjusted. Against thistripper, when turned down, the top of the rod I or the linger-piece thereon is made to come in contact when the bell assumes avertical position, and then the rod I is forced down and the hammer allowed to move. \Vhen the tripper is turned up or out of the way, the hammer will be stopped.

The bell-striking mechanism being wound up and the tripper turned up, and the bell.

located upon any table or stand,'it may be employed as an ordinary call-bell, to sound which it is only necessary to depress the rod I, which may be done by touching the finger-piece cor by turning the tripper down, the rod returning to its normal position and the ringing being stopped as soon as the rod is released.

To set the apparatus for a burglar-alarm, the bell is connected with any door, window, or other barrier or movable object by use of a cord or cords, line or lines, so drawnas to hold the bell in deflected position or out of thenormal vertical position, and then the ringing mechanism is wound up and the tripper turned down. As soon as one of the cords is slackened, the hell by its own gravity swings down to the vertical line,and thus carries the rod I or thumb-piece into contact with the tripper, by which the rod is depressed and the alarm sounded.

If it be desired to stop the alarm before the mainspring runs down, as frequently it is desired, the tripper has only to be turned up.

The alarm may be located at any desired part of the room, upon atable, chair, or other object, or upon the floor, and the line or lines bolt or other device which must be drawn back in order to release the door or barrier. The part fhas a spring, f applied upon the side opposite f, so that when the hook is inserteduntil either bolt is withdrawn, when the hook is immediately released, in a manner which will be readily-understood. The springf in no wise interferes with the insertion of the hook between the sashes of a window or in any other narrow opening. The cord or line h attached to this catch is made of elastic materialas covered rubberand connects also with the bell, either directly or through the medium of other cords. It is made elastic,so that it may be stretched to make the desired connect-ions, and thus obviate accurate locations of the bell, as would be required if the cord were inelastic, and also so as to faciltate and insure the releasing of the catch as soon as the part to which it is applied is moved. This same catch may be introduced between any of the rails or cross-pieces of the sashes of a window, as indicated in Fig. 6, and whenever the lower sash is raised or the upper one depressed it will be instantly released and the alarm sounded,in a manner which will be readily understood. f

1 To employ the alarm mechanism in connecwith a door and a window, the elastic cord I1, with the improved form of catch, is located as indicated in Fig. 9, and a second elastic or other line, h, connected with h and led away to the bell.

For two windows, the arrangement indicated in Fig. 10 may be employed. For a single window, door, or barrier, of course the line it may be carried directly to the bell, and for any number the cord may be passed through the opening provided for it in' the end of the catch. These examples will. indicate how the apparatus may be employed in any situation following same general principles. The connection with the bell is preferably made at the bottom by any simple hook,.or otherwise, as indicated in Fig. 5, the line holding the bell in deflected position until released. Like results would follow the attachment of the cord or line at a point above the shaft upon which the bell swings, as upon a projecting arm, such as represented at i in dotted lines, Figs. 1 and 5.

The device is simple and easily operated, and will be found to answer the purpose or object of the invention, as previously set forth.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a device of the character herein set forth, the bell mounted upon a standard or base and arranged to swing thereon, said bell carrying the striking mechanism, and the vertically-moving spring-actuated rod having the stop-pin applied thereto for arresting or releasing the striking mechanism, and the adjustable tripper mounted upon the standard and arranged to depress the rod, these parts being combined and arranged substantially as shown and described.

2. In a combined burglar-alarm and callbell, the vertically-moving rod I, provided with an extended piece upon its upper end, and carrying the stop-pin for arresting the movements of the striking-hammer, said rod being held up by a suitable spring and arranged to be depressed by the finger or by the tripper, which is mounted upon and made adjustable upon the standard, substantially as and for the purposes set forth.

3. The combination, with the lock-bolt or latch bolt of a door-lock, of a burglar-alarm mechanism, substantially as described, the said alarm mechanism being connected with the said bolt by a cord or line, and a hook applied thereon and entering between the door 20 and its jamb, which hook is arranged to project over the bolt and to be released therefrom as soon as the bolt is withdrawn and before the door is opened, substantially as shown and described.

4. In combination with the swinging bell, the elastic cord or line connected at one end with the bell and at the other with a hook or catch applied and arranged to be released, substantially as shown and described, and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand in the presence of two witnesses.

GEORGE W. NELSON. Witnesses:

JOHN BUCKLER, WORTH OSGOOD. 

